Second PS3 Crash

Hello. My son has purchased 2 60 gb PS3's. He had the first one for only one day and lost power multiple times. Games played: FIFA '08 and Call of Duty 4. During Call of Duty 4 (not online) only, first PS3 crashed.He exchanged the first system for a new one, played Call of Duty 4 online, and it crashed. Cannot power up at all now. Is there a batch of bad PS3's? First system returned, lost one game because they couldn't open it. Now Call of Duty 4 is stuck in the second one.He wants his Call of Duty 4, how do we get it out? Is it worth taking it back and exchanging it for a third one? Both systems were bought at the Sony store in Palo Alto. Thank you for your time.